How to auto-scroll back to top for every slide in ionic?

Hi, I have set up some slides with different height.

Slide 1 got may be 2000px , slide 2 got 500px

and whenever I scroll to the bottom in slide 1 and then swipe to slide 2, it will be scrolled to the 1500px blank area of slide 2. So I tried to put it ng-init with a function $ionicScrollDelegate.scrollTop(); , but it didn;t work

is there any other way to do this ?

I have just figured it out to put it with ionic on-slide-changed~ thanks all